作业帮求教非谓语动词
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求教非谓语动词
非谓语动词
动 词 不 定 式
动词不定式是一种非谓语动词,由不定式符号to加原形动词构成,动词不定式保留着动词的一些特征：
(1)带宾语或表语.例如：
I want to watch TV.
I hope to be an outstanding student.
(2)可由状语修饰.例如：
I expect you to study hard.
(3)有时态和语态的变化.例如：
I’m sorry to have kept you waiting.（完成时）
The questions to be answered are on page 10.（被动式）
动词不定式和它的宾语,状语,或表语一起构成不定式短语.不定式或不定式短语具有名词,形容词,和副词的性质,因而可以在句中作主语,宾语,表语,定语,和状语.
在不定式符号to前加上not构成不定式的否定式.例如：
He told me not to touch the wire.
I. 动词不定式的句法作用
1.作主语
To master a foreign language is very important.
Not to smoke will do you a lot of good.
To obey the laws is everyone’s duty.
动词不定式作主语时,常常用先行词it作形式主语,放在句首,将不定式移到谓语之后作实际主语.例如：
It is difficult to answer such a complicated question in English.
It has been possible to send man to space.
It takes the electronic computer only a few seconds to solve the problem.
Example:
______ only five minutes to finish the task.
a. It took myself b. It required me c. It should be needing d. It took me
2.作表语
Our main task is to carry these building materials to the work site.
The most common way of getting heat is to burn fuel.
Our goal is to accomplish the modernization of agriculture, industry, national defence, and science and technology.
Example:
My job ______ these children.
a. was to look after b. was looking c. is to looking after d. has looked after
3．作宾语
在及物动词begin, cease, choose, continue, decide, expect, fail, forget, happen, hate, help, hope, intend, like, love, manage, mean, offer, plan, prefer, prepare, promise, refuse, remember, try, want, wish 等后边常用不定式作宾语.例如：
When did you begin to learn English?
Once you turn off the switch, electricity ceases to flow.
He promised to keep the secret for you.
Example:
Galieo planned to ______ the problem, but failed to do so.
a. solving b. have solved c. be solved d. have been solved
If you promise ______ angry with me, I’ll tell you what I broke.
a. get not b. not get c. not to get d. not getting
注意：当不定式作直接宾语,它后面还有宾语补足语时,需用it 作形式宾语代替不定式,而把不定式放在补足语之后.例如：
I found it difficult to identify mistakes. 我发现辨认错误很难.
Do you consider it wise to ignore him? 你认为不理睬他是明智的吗?
Example:
I found _____ to answer all the questions within the time given.
a. no possibility b. there was impossibility c. impossible d. it impossible
动词不定式也可作介词but, except, save（除.以外）的宾语,但在词组can not but （不由得,只好）, cannot help but（不得不）, do nothing but（别无它法只有.）后面,接不带 to 的不定式.在except, save 后可带to也可不带 to.例如：
The National Guardsmen were given no choice but to shoot over the heads of the unruly mob.
She does nothing but cry all day.
We cannot but believe in the youth who is always trying to improve himself.
He did nothing except play all day long.
There is nothing for it but to wait for an opportunity.
Example:
He was no alternative but ______ to see him.
a. go b. went c. going d. to go
I _____ at our teacher’s remarks.
a. cannot but wonder b. cannot help but to wonder
c. cannot but wondering d. cannot help but wondering
4．作宾语补足语
有些动词如allow, advise, ask, beg, believe, can’t bear, call, choose, cause, command, determine, enable, expect, fail, feel, find, force, get, have, hear, help, know, invite, lead, let, like, make, notice, order, prove, request, set, see, teach, tell, think, want, warn, watch, wish等后面常跟动词不定式作宾语补足语.
注意：在make（使）, let（让）, have（使,叫）等使役动词后；在see（看）, watch （观看）, look at（看）, behold（看）, observe（观察,看见）, perceive（看见）, feel（感觉）, hear（听）, listen to （听...）, notice（发现,注意）等表示感官的动词后及在know（了解）, please（请）等后面省去动词不定式符号“to”.
在动词find与 help 之后的“to”可省也不可省.例如：
I asked him to tell me the results of the scientific research.
Can you help me (to) clean the windows?
Ask her to wait for me at the gate.
Her mother never has her do that heavy work.
Example:
Professor Black had us ______ compositions every Friday.
a. to write b. written c. write d. wrote
My boss asked me to answer the phone, to take all messages, and ______ some letters.
a. to type b. typing c. type d. typewrite
My teacher told me _____ so careless.
a. not be b. don’t to be c. not to be d. won’t be
有些动词如consider, prove, think, know, feel, suppose, discover, imagine, find 等也可跟
“宾语 + to be”的形式,使用中应注意.例如：
We found him (to be ) dishonest. 我们发现他不诚实.
We all know him to be dead. 我们都以为他死了.
Example:
We ______ Mr. Brown to be a fine writer.
a. accept b. receive c. think d. regard
5．作主语补足语
如果把动词不定式作宾语补足语的句中的谓语由主动语态改为被动语态,则宾语补足语就成了主语补足语.要注意作宾语补足语时在某些动词后省去的不定式符号to, 此时一般不能省去.例如：
Plastics are found to be good insulators.
Water power can be made to produce electricity.
The laboring people of the world are called on to unite.
号召全世界的劳动人民团结起来.
Example:
Children should be allowed ______ their own decisions.
a. making b. to make c. make d. having made
6.作定语
My father didn’t have any chance to go to school before liberation.
Energy is the ability to do work.
Please give me something to drink.
Example:
The order ______ pumps will come from the control room.
a. stopping b. to stop c. stopped d. stops
Have you any other question______?
a. ask b. for ask c. to ask d. asking
注意：当被不定式修饰的名词与后面的不定式有动宾关系时（即为逻辑宾语）,不定式结尾表示动宾关系的介词不要丢掉.例如：
At last we found a room to live in.
I haven’t got a chair to sit on.
Example:
I’m not sure which restaurant ______.
a. to eat on b. eating at c. to eat at d. for eating
“I want to buy a camera.” “We have several models____”
a. for you to choose from b. for your choice
c. for the choice of yours d. for you to choose at
7.作状语
表示目的,结果,原因等,常有以下几种情况：
(1) 用to + 原形动词,in order to + 原形动词或so as to + 原形动词引起不定式短语表示
目的,结果,原因.例如：
To meet the needs of our industry, we must produce more coal.
为了满足我国工业的需要,我们必须生产更多的煤碳.（表目的）
The temperature is so high as to change water into steam.
温度高到可使水变成蒸汽.（表结果）
They were glad to hear from you. 收到你的信他们很高兴.（表原因）
Example:
Send him to the baker’s ______ the bread.
a. to buy b. in order he buys c. for to buy d. for buying
Grace advised us to withdraw ______.
a. so as to get not involved b. as not to get involved
c. so as not to get involved d. so that not to involve
(2) 用在easy, difficult, hard, heavy, good等形容词作表语的系表结构中的形容词后,
是存在谓语所表示的情况,不定式要用主动式.例如：
Electricity is easy to transmit over long distances.
This question is hard to answer.
Example:
Most college students want to be ______ to choose their favorite subjects.
a. freely b. freedom c. free d. freed
(3) 在 “too...to”句型中,不定式含有否定意义,表示“结果”.
He was too busy to help me at the moment.
He was too exited to speak.
Example:
They were ______ to go any further.
a. too frightened b. as frightened as c. so frightened as d. too frightened for
注：一般情况下,句子的主语也是不定式的逻辑主语,要注意它们的一致.
Example:
To learn to speak English well, ______.
a. much practice is needed b. one needs much practice
c. much practice is in need d. much practice one is needed
EXERCISE
1. Please let me know what you intend _____.
a. will do b. do c. to do d. doing
2. Would you be _____ to step this way, please?
a. too kind b. so kind c. so kind as d. as
3. They have made the oil and water ____ from each other.
a. to separate b. separate c. to be separated d. to have separated
4. It is very important ____ our teaching methods.
a. to improve to b. improve c. improved d. to improve
5. I have warned you time and again ____ the wire.
a. not touch b. not touching c. not to touch d. touch not
6. “Where should I send my application?”
“The Personnel Office is the place____.”
a. to send it b. send it to c. to send it to d. for sending it
7. Would you please ____ the door for me?
a. holding b. not to hold c. hold d. held
8. My brother’s wish is ____ an engineer.
a. becomes b. to become c. become d. becoming to be
9. Have you heard him ____ about his former teacher?
a. spoke b. to speak c. speaks d. speak
10. Can you let me ____ the truth of the matter?
a. to know b. knowing c. know d. known
11. ____ for the people is weightier than Mount Tai.
a. Die b. Dead c. To death d. To die
12. If you ask your mother, she will probably ___.
a. let you to go b. allow you to go c. allow that you go d. let you go
13. Did you notice the girl ____.
a. cross the road b. across the road c. to cross the road d. having cross the road
14. Comrade Li is known ____ an advanced worker.
a. being b. is c. be d. to be
15. Seeing an old man getting off the train, she hurried over ____ things for him.
a carrying b. to carry c. carried d. for carrying
16. We’d really like you ____ to the party tonight.
a. come b. to come c. will come d. should come
17. It is a teacher’s duty ____ the rising generation.
a. educate b. educating c. to educate d. educates
18. The best way ____ this principle is to see how it actually works in practice.
a. understanding b. to understand c. being understood d. to have understood
19. If the maid comes today, please have her ____ my shirts.
a. washed b. washing c. to washing d. wash
20. We can do nothing but ____ the experiment.
a. to repeat b. repeat c. repeating d. repeated
21. Such a thing should never have been allowed ____ in the first place.
a. happens b. happen c. to happen d. happening
22. In the days ____, China’s atomic energy industry will better serve the needs of the national economy and the people’s livelihood.
a. will come b. come c. came d. to come
23. Have you got any thing ____ about this matter?
a. saying b. to say c. said d. say
24. He was not ____ try it again.
a. such a fool as to b. so a fool as to c. a fool such as to d. a fool so as to
25. He was too excited ____.
a. to go to sleeping b. to slept c. to go to sleep d. going to sleep
26. We can’t have him ____ like that all day.
a. to work b. working c. to be worked d. work
27. This will enable us ____ the problem quickly and accurately.
a. solving b. to solve c. to have solving d. solve
28. All he wanted was ____ his job well; he never sought personal gain.
a. do b. in doing c. to do d. to doing
29. I spoke so slowly and clearly as ____ fully understood.
a. making myself b. to make myself to be c. to make myself d. to make me to understand
30. To die for the people’s sake is ____ a worthy death.
a. dead b. dying c. to die d. have
II. 特殊不定式短语
1. 不定式复合结构：for + 名词（代词）+不定式（短语）
一般说,句中谓语动词的主语就是动词不定式（短语）的逻辑主语.但是有时它还有自己的逻辑主语,由介词for引出.动词不定式加上自己的逻辑主语一起构成复合结构.这种复合结构在句中句法作用与不定式基本相同.如果句中的形容词既指行为的性质又指行为的人,则用of引出这一结构.例如：
(1)作主语
It is necessary for us to catch up with the world’s advanced levels.
It is very kind of you to send us so many books.
(2)作表语
The question is for me to answer.
The school regulations are for every student to observe.
(3)作宾语
The development of the rocket makes it possible for man to enter space.
Closed-circuit television makes it easy for a large number of students to see everything a teacher demonstrates.
(4)作定语
In doing research work, there are often a lot of difficulties for the scientists to overcome.
(5)作状语
He speaks too quickly for me to understand.
For a machine to do work, we must do work on the machine.
Example:
Is it necessary ____ the book immediately?
a. for him to return b. that he returns c. his returning d. to him return
The problem is ____.
a. very difficult for me to solve b. too difficult for I to solve it
c. too difficult for me to solve d. very difficult, I can’t solve
It’s very kind ____ invite me.
a. form you to b. of you to c. by you to d. that you
2. 疑问词+动词不定式
疑问代词who, what, which和疑问副词when, where, how等后面加上动词不定式,构成具有名词作用的短语.
(1)作主语
How to solve the problem will be discussed at the meeting.
Who to be elected chairman remains unknown.
(2)作表语
What we discussed is where to store these materials.
The question is what to do and how to do next.
(3)作宾语
Do you know how to answer the question?
We’ve learned what to do in face of difficulties.
(4)作定语
Nobel began to seek ways in which to make nitroglycerin safer to handle.
Example:
Do you know ____ the repairs?
a. to do b. how to do c. to make d. how to make
There isn’t any difference between the two. I really don’t know ____.
a. where to choose b. which to choose c. to choose what d. to choose which
The problem we are discussing now is ____ harness the great power from within the earth.
a. how can b. when can c. how to d. what to
3. 独立动词不定式
独立动词不定式具有插入语的性质,表示说话人的态度或看法.例如：
To tell the truth, that is all I know about him.
To be frank with you, I don’t like the color of your shirt.
To begin with, you must move all the equipment into the laboratory.
To be sure, he’s rather old for such an important work.
Example:
____, he studied very hard these days.
a. Being fair b. To be fair c. Fair enough d. To be enough fair
To ____ with, I wound like to talk about my new plan.
a. take b. get c. make d. begin
4. 动词不定式符号to后动词的省略
在并列句或复合句中,如果前一个分句与后一个分句或主句与从句用同一个动词,则后一句中可省去动词而保留 “to”.例如：
He will begin his research work as soon as possible if he is allowed to.
We shall do that test again if we are required to.
He refused to take a rest, though we had asked him to.
Example:
“will the Smiths be going abroad this summer?” “No, they finally decided ____.”
a. not going b. not to c. not to be d. not to going
He does not plan to learn German, but ____.
a. so do I b. I do so c. I so want d. I want to
EXERCISE
1. To ____the truth, I forgot all about my promise.
a. remark b. speak c. talk d. tell
2. My home town has changed too much ____.
a. I can’t recognize b. for me to recognize c. to recognize d. to me to recognize
3. I want to learn more about the American political system, but I don’t know ____ the
information.
a. where to get b. how get c. when d. what to get
4. The great secret of success is to know ____.
a. how learn b. how learning c. how to learn d. to learn how
5. It was a bolt from the blue, so ____.
a. speaks b. it speak c. to speak d. speaking
6. ____ has not been decided yet.
a. To start when b. Why to start c. When to start d. Start to where
7. What I thought of was ____ the difficulty.
a. where to tide over b. how over to tide c. which to over tide d. how to tide over
8. ____ there must be air and water.
a. For there is life b. For there to be life c. For to be life there d. For life is there
9. ____, you would think he was a millionaire.
a. To hear talk b. To hear he talking c. To hear him talk d. Hearing he talk
10. Do you think it difficult ____?
a. for me to do so b. for my to do so c. for I to do so d. for me doing so
11. Is it possible ____ at the present time?
a. for weather to control man b. for man to control weather
c. to control weather for man d. for man control weather
12. Yet it took another thirty years ____ an industry.
a. TV to became b. TV becomes c. for TV to become d. to TV for coming
13. A man who really knows ____ will always be successful.
a. how to eat b. how to play c. how to learn d. how to count
14. She keeps telling us ____.
a. what to do b. doing what c. what is doing d. do what
15. I think it impossible for anyone ____ in advance what the results of the test will be.
a. tell b. telling c. tells d. to tell
16. It is only a suggestion and you can do ____.
a. you like to do what b. what you like to do it c. what you like to d. what to you like
17. It is hardly possible for him ____ this article without using a dictionary.
a. translated b. translating c to translate d. translates
18. The general principles of TV are not difficult ___.
a. to us to understand b. to understand for us c. for us understood d. for us to understand
19. The most important problem is ____ and how to serve.
a. who to serve b. who serves c. whom to serve d. to serve who
20. ____ is not known.
a. Whom to begin the running test b. When to begin the running test
c. When the running test begin d. How begin to the running test
21. ____ the job alone is impossible.
a. To him to do b. For him doing c. For him to do d. For he to do
22. ____, they will overtake us before long.
a. Making sure b. To be sure c. Sure enough d. To make sure of
23. ____ it should be made clear.
a What to do b. Why to do c. Whom to do d. When can do
24. A machine makes it possible ____ a large force with a small one.
a. people overcome b. to people for overcoming
b. for people overcoming d. for people to overcome
25. I wanted very much to lie down and rest, but I ____.
a. don’t dare b. don’t dare to c. didn’t dare to d. daren’t to
III. 动词不定式的时态和语态
动词不定式保留了动词的一些特征,具有时态和语态的变化,但是它的时态和语态只有以下几种,见下表.
1．动词不定式的时态和语态形式（以make为例）
语态
时态
主 动 语 态
被 动 语 态
一般时
to make
to be made
进行时
to be making
完成时
to have made
to have been made
完成进行时
to have been making
2. 一般式：不定式的一般式表示的动作或状态与谓语动词表示的动作同时发生或在起之后发生.例如：
I saw him climb up the tree.
Be quite. Our monitor has a piece of good news to tell us.
We hope to build up a modern laboratory before long.
我们在I.中所运用的动词不定式均为一般式的主动语态,这里不再多举例.
3. 进行式：不定式进行式表示的动作在谓语动词表示的动作发生时正在进行.例如：
The water seems to be boiling.
She was found to be teaching the pupils to make model planes.
Example:
If you are traveling forwards in a train, the things around you outside seem ____ backwards.
a. having moved b. to have moved c. to be moving d. to moving
4. 完成式：动词不定式表示的动作在谓语动词表示的动作之前发生.例如：
They are known to have come to a decision on the matter.
It was a great satisfaction to have revisited our native village.
如果动词不定式的完成式用在表示“需要”,“希望”,“打算”等意义的动词如hope, wish, expect, intend, mean 后以及用在情态动词should, could, ought(to), might和be to的过去时后,则说明动作没有实现.例如：
We meant to have had a meeting to discuss this problem.
我们本来打算开个会讨论这个问题.（但结果却没有开）
You should have switched off the light when you left the classroom.
你离开教室的时候应该把灯关掉.（实际上没有关灯）
We were to have built a laboratory behind the lecture building.
我们原来要在教学大楼后边盖一座实验室.（但后来没有盖）
Example:
Some people were reported ____ flying saucers that same evening.
a. to b. to ha
动 词 不 定 式
动词不定式是一种非谓语动词,由不定式符号to加原形动词构成,动词不定式保留着动词的一些特征：
(1)带宾语或表语.例如：
I want to watch TV.
I hope to be an outstanding student.
(2)可由状语修饰.例如：
I expect you to study hard.
(3)有时态和语态的变化.例如：
I’m sorry to have kept you waiting.（完成时）
The questions to be answered are on page 10.（被动式）
动词不定式和它的宾语,状语,或表语一起构成不定式短语.不定式或不定式短语具有名词,形容词,和副词的性质,因而可以在句中作主语,宾语,表语,定语,和状语.
在不定式符号to前加上not构成不定式的否定式.例如：
He told me not to touch the wire.
I. 动词不定式的句法作用
1.作主语
To master a foreign language is very important.
Not to smoke will do you a lot of good.
To obey the laws is everyone’s duty.
动词不定式作主语时,常常用先行词it作形式主语,放在句首,将不定式移到谓语之后作实际主语.例如：
It is difficult to answer such a complicated question in English.
It has been possible to send man to space.
It takes the electronic computer only a few seconds to solve the problem.
Example:
______ only five minutes to finish the task.
a. It took myself b. It required me c. It should be needing d. It took me
2.作表语
Our main task is to carry these building materials to the work site.
The most common way of getting heat is to burn fuel.
Our goal is to accomplish the modernization of agriculture, industry, national defence, and science and technology.
Example:
My job ______ these children.
a. was to look after b. was looking c. is to looking after d. has looked after
3．作宾语
在及物动词begin, cease, choose, continue, decide, expect, fail, forget, happen, hate, help, hope, intend, like, love, manage, mean, offer, plan, prefer, prepare, promise, refuse, remember, try, want, wish 等后边常用不定式作宾语.例如：
When did you begin to learn English?
Once you turn off the switch, electricity ceases to flow.
He promised to keep the secret for you.
Example:
Galieo planned to ______ the problem, but failed to do so.
a. solving b. have solved c. be solved d. have been solved
If you promise ______ angry with me, I’ll tell you what I broke.
a. get not b. not get c. not to get d. not getting
注意：当不定式作直接宾语,它后面还有宾语补足语时,需用it 作形式宾语代替不定式,而把不定式放在补足语之后.例如：
I found it difficult to identify mistakes. 我发现辨认错误很难.
Do you consider it wise to ignore him? 你认为不理睬他是明智的吗?
Example:
I found _____ to answer all the questions within the time given.
a. no possibility b. there was impossibility c. impossible d. it impossible
动词不定式也可作介词but, except, save（除.以外）的宾语,但在词组can not but （不由得,只好）, cannot help but（不得不）, do nothing but（别无它法只有.）后面,接不带 to 的不定式.在except, save 后可带to也可不带 to.例如：
The National Guardsmen were given no choice but to shoot over the heads of the unruly mob.
She does nothing but cry all day.
We cannot but believe in the youth who is always trying to improve himself.
He did nothing except play all day long.
There is nothing for it but to wait for an opportunity.
Example:
He was no alternative but ______ to see him.
a. go b. went c. going d. to go
I _____ at our teacher’s remarks.
a. cannot but wonder b. cannot help but to wonder
c. cannot but wondering d. cannot help but wondering
4．作宾语补足语
有些动词如allow, advise, ask, beg, believe, can’t bear, call, choose, cause, command, determine, enable, expect, fail, feel, find, force, get, have, hear, help, know, invite, lead, let, like, make, notice, order, prove, request, set, see, teach, tell, think, want, warn, watch, wish等后面常跟动词不定式作宾语补足语.
注意：在make（使）, let（让）, have（使,叫）等使役动词后；在see（看）, watch （观看）, look at（看）, behold（看）, observe（观察,看见）, perceive（看见）, feel（感觉）, hear（听）, listen to （听...）, notice（发现,注意）等表示感官的动词后及在know（了解）, please（请）等后面省去动词不定式符号“to”.
在动词find与 help 之后的“to”可省也不可省.例如：
I asked him to tell me the results of the scientific research.
Can you help me (to) clean the windows?
Ask her to wait for me at the gate.
Her mother never has her do that heavy work.
Example:
Professor Black had us ______ compositions every Friday.
a. to write b. written c. write d. wrote
My boss asked me to answer the phone, to take all messages, and ______ some letters.
a. to type b. typing c. type d. typewrite
My teacher told me _____ so careless.
a. not be b. don’t to be c. not to be d. won’t be
有些动词如consider, prove, think, know, feel, suppose, discover, imagine, find 等也可跟
“宾语 + to be”的形式,使用中应注意.例如：
We found him (to be ) dishonest. 我们发现他不诚实.
We all know him to be dead. 我们都以为他死了.
Example:
We ______ Mr. Brown to be a fine writer.
a. accept b. receive c. think d. regard
5．作主语补足语
如果把动词不定式作宾语补足语的句中的谓语由主动语态改为被动语态,则宾语补足语就成了主语补足语.要注意作宾语补足语时在某些动词后省去的不定式符号to, 此时一般不能省去.例如：
Plastics are found to be good insulators.
Water power can be made to produce electricity.
The laboring people of the world are called on to unite.
号召全世界的劳动人民团结起来.
Example:
Children should be allowed ______ their own decisions.
a. making b. to make c. make d. having made
6.作定语
My father didn’t have any chance to go to school before liberation.
Energy is the ability to do work.
Please give me something to drink.
Example:
The order ______ pumps will come from the control room.
a. stopping b. to stop c. stopped d. stops
Have you any other question______?
a. ask b. for ask c. to ask d. asking
注意：当被不定式修饰的名词与后面的不定式有动宾关系时（即为逻辑宾语）,不定式结尾表示动宾关系的介词不要丢掉.例如：
At last we found a room to live in.
I haven’t got a chair to sit on.
Example:
I’m not sure which restaurant ______.
a. to eat on b. eating at c. to eat at d. for eating
“I want to buy a camera.” “We have several models____”
a. for you to choose from b. for your choice
c. for the choice of yours d. for you to choose at
7.作状语
表示目的,结果,原因等,常有以下几种情况：
(1) 用to + 原形动词,in order to + 原形动词或so as to + 原形动词引起不定式短语表示
目的,结果,原因.例如：
To meet the needs of our industry, we must produce more coal.
为了满足我国工业的需要,我们必须生产更多的煤碳.（表目的）
The temperature is so high as to change water into steam.
温度高到可使水变成蒸汽.（表结果）
They were glad to hear from you. 收到你的信他们很高兴.（表原因）
Example:
Send him to the baker’s ______ the bread.
a. to buy b. in order he buys c. for to buy d. for buying
Grace advised us to withdraw ______.
a. so as to get not involved b. as not to get involved
c. so as not to get involved d. so that not to involve
(2) 用在easy, difficult, hard, heavy, good等形容词作表语的系表结构中的形容词后,
是存在谓语所表示的情况,不定式要用主动式.例如：
Electricity is easy to transmit over long distances.
This question is hard to answer.
Example:
Most college students want to be ______ to choose their favorite subjects.
a. freely b. freedom c. free d. freed
(3) 在 “too...to”句型中,不定式含有否定意义,表示“结果”.
He was too busy to help me at the moment.
He was too exited to speak.
Example:
They were ______ to go any further.
a. too frightened b. as frightened as c. so frightened as d. too frightened for
注：一般情况下,句子的主语也是不定式的逻辑主语,要注意它们的一致.
Example:
To learn to speak English well, ______.
a. much practice is needed b. one needs much practice
c. much practice is in need d. much practice one is needed
EXERCISE
1. Please let me know what you intend _____.
a. will do b. do c. to do d. doing
2. Would you be _____ to step this way, please?
a. too kind b. so kind c. so kind as d. as
3. They have made the oil and water ____ from each other.
a. to separate b. separate c. to be separated d. to have separated
4. It is very important ____ our teaching methods.
a. to improve to b. improve c. improved d. to improve
5. I have warned you time and again ____ the wire.
a. not touch b. not touching c. not to touch d. touch not
6. “Where should I send my application?”
“The Personnel Office is the place____.”
a. to send it b. send it to c. to send it to d. for sending it
7. Would you please ____ the door for me?
a. holding b. not to hold c. hold d. held
8. My brother’s wish is ____ an engineer.
a. becomes b. to become c. become d. becoming to be
9. Have you heard him ____ about his former teacher?
a. spoke b. to speak c. speaks d. speak
10. Can you let me ____ the truth of the matter?
a. to know b. knowing c. know d. known
11. ____ for the people is weightier than Mount Tai.
a. Die b. Dead c. To death d. To die
12. If you ask your mother, she will probably ___.
a. let you to go b. allow you to go c. allow that you go d. let you go
13. Did you notice the girl ____.
a. cross the road b. across the road c. to cross the road d. having cross the road
14. Comrade Li is known ____ an advanced worker.
a. being b. is c. be d. to be
15. Seeing an old man getting off the train, she hurried over ____ things for him.
a carrying b. to carry c. carried d. for carrying
16. We’d really like you ____ to the party tonight.
a. come b. to come c. will come d. should come
17. It is a teacher’s duty ____ the rising generation.
a. educate b. educating c. to educate d. educates
18. The best way ____ this principle is to see how it actually works in practice.
a. understanding b. to understand c. being understood d. to have understood
19. If the maid comes today, please have her ____ my shirts.
a. washed b. washing c. to washing d. wash
20. We can do nothing but ____ the experiment.
a. to repeat b. repeat c. repeating d. repeated
21. Such a thing should never have been allowed ____ in the first place.
a. happens b. happen c. to happen d. happening
22. In the days ____, China’s atomic energy industry will better serve the needs of the national economy and the people’s livelihood.
a. will come b. come c. came d. to come
23. Have you got any thing ____ about this matter?
a. saying b. to say c. said d. say
24. He was not ____ try it again.
a. such a fool as to b. so a fool as to c. a fool such as to d. a fool so as to
25. He was too excited ____.
a. to go to sleeping b. to slept c. to go to sleep d. going to sleep
26. We can’t have him ____ like that all day.
a. to work b. working c. to be worked d. work
27. This will enable us ____ the problem quickly and accurately.
a. solving b. to solve c. to have solving d. solve
28. All he wanted was ____ his job well; he never sought personal gain.
a. do b. in doing c. to do d. to doing
29. I spoke so slowly and clearly as ____ fully understood.
a. making myself b. to make myself to be c. to make myself d. to make me to understand
30. To die for the people’s sake is ____ a worthy death.
a. dead b. dying c. to die d. have
II. 特殊不定式短语
1. 不定式复合结构：for + 名词（代词）+不定式（短语）
一般说,句中谓语动词的主语就是动词不定式（短语）的逻辑主语.但是有时它还有自己的逻辑主语,由介词for引出.动词不定式加上自己的逻辑主语一起构成复合结构.这种复合结构在句中句法作用与不定式基本相同.如果句中的形容词既指行为的性质又指行为的人,则用of引出这一结构.例如：
(1)作主语
It is necessary for us to catch up with the world’s advanced levels.
It is very kind of you to send us so many books.
(2)作表语
The question is for me to answer.
The school regulations are for every student to observe.
(3)作宾语
The development of the rocket makes it possible for man to enter space.
Closed-circuit television makes it easy for a large number of students to see everything a teacher demonstrates.
(4)作定语
In doing research work, there are often a lot of difficulties for the scientists to overcome.
(5)作状语
He speaks too quickly for me to understand.
For a machine to do work, we must do work on the machine.
Example:
Is it necessary ____ the book immediately?
a. for him to return b. that he returns c. his returning d. to him return
The problem is ____.
a. very difficult for me to solve b. too difficult for I to solve it
c. too difficult for me to solve d. very difficult, I can’t solve
It’s very kind ____ invite me.
a. form you to b. of you to c. by you to d. that you
2. 疑问词+动词不定式
疑问代词who, what, which和疑问副词when, where, how等后面加上动词不定式,构成具有名词作用的短语.
(1)作主语
How to solve the problem will be discussed at the meeting.
Who to be elected chairman remains unknown.
(2)作表语
What we discussed is where to store these materials.
The question is what to do and how to do next.
(3)作宾语
Do you know how to answer the question?
We’ve learned what to do in face of difficulties.
(4)作定语
Nobel began to seek ways in which to make nitroglycerin safer to handle.
Example:
Do you know ____ the repairs?
a. to do b. how to do c. to make d. how to make
There isn’t any difference between the two. I really don’t know ____.
a. where to choose b. which to choose c. to choose what d. to choose which
The problem we are discussing now is ____ harness the great power from within the earth.
a. how can b. when can c. how to d. what to
3. 独立动词不定式
独立动词不定式具有插入语的性质,表示说话人的态度或看法.例如：
To tell the truth, that is all I know about him.
To be frank with you, I don’t like the color of your shirt.
To begin with, you must move all the equipment into the laboratory.
To be sure, he’s rather old for such an important work.
Example:
____, he studied very hard these days.
a. Being fair b. To be fair c. Fair enough d. To be enough fair
To ____ with, I wound like to talk about my new plan.
a. take b. get c. make d. begin
4. 动词不定式符号to后动词的省略
在并列句或复合句中,如果前一个分句与后一个分句或主句与从句用同一个动词,则后一句中可省去动词而保留 “to”.例如：
He will begin his research work as soon as possible if he is allowed to.
We shall do that test again if we are required to.
He refused to take a rest, though we had asked him to.
Example:
“will the Smiths be going abroad this summer?” “No, they finally decided ____.”
a. not going b. not to c. not to be d. not to going
He does not plan to learn German, but ____.
a. so do I b. I do so c. I so want d. I want to
EXERCISE
1. To ____the truth, I forgot all about my promise.
a. remark b. speak c. talk d. tell
2. My home town has changed too much ____.
a. I can’t recognize b. for me to recognize c. to recognize d. to me to recognize
3. I want to learn more about the American political system, but I don’t know ____ the
information.
a. where to get b. how get c. when d. what to get
4. The great secret of success is to know ____.
a. how learn b. how learning c. how to learn d. to learn how
5. It was a bolt from the blue, so ____.
a. speaks b. it speak c. to speak d. speaking
6. ____ has not been decided yet.
a. To start when b. Why to start c. When to start d. Start to where
7. What I thought of was ____ the difficulty.
a. where to tide over b. how over to tide c. which to over tide d. how to tide over
8. ____ there must be air and water.
a. For there is life b. For there to be life c. For to be life there d. For life is there
9. ____, you would think he was a millionaire.
a. To hear talk b. To hear he talking c. To hear him talk d. Hearing he talk
10. Do you think it difficult ____?
a. for me to do so b. for my to do so c. for I to do so d. for me doing so
11. Is it possible ____ at the present time?
a. for weather to control man b. for man to control weather
c. to control weather for man d. for man control weather
12. Yet it took another thirty years ____ an industry.
a. TV to became b. TV becomes c. for TV to become d. to TV for coming
13. A man who really knows ____ will always be successful.
a. how to eat b. how to play c. how to learn d. how to count
14. She keeps telling us ____.
a. what to do b. doing what c. what is doing d. do what
15. I think it impossible for anyone ____ in advance what the results of the test will be.
a. tell b. telling c. tells d. to tell
16. It is only a suggestion and you can do ____.
a. you like to do what b. what you like to do it c. what you like to d. what to you like
17. It is hardly possible for him ____ this article without using a dictionary.
a. translated b. translating c to translate d. translates
18. The general principles of TV are not difficult ___.
a. to us to understand b. to understand for us c. for us understood d. for us to understand
19. The most important problem is ____ and how to serve.
a. who to serve b. who serves c. whom to serve d. to serve who
20. ____ is not known.
a. Whom to begin the running test b. When to begin the running test
c. When the running test begin d. How begin to the running test
21. ____ the job alone is impossible.
a. To him to do b. For him doing c. For him to do d. For he to do
22. ____, they will overtake us before long.
a. Making sure b. To be sure c. Sure enough d. To make sure of
23. ____ it should be made clear.
a What to do b. Why to do c. Whom to do d. When can do
24. A machine makes it possible ____ a large force with a small one.
a. people overcome b. to people for overcoming
b. for people overcoming d. for people to overcome
25. I wanted very much to lie down and rest, but I ____.
a. don’t dare b. don’t dare to c. didn’t dare to d. daren’t to
III. 动词不定式的时态和语态
动词不定式保留了动词的一些特征,具有时态和语态的变化,但是它的时态和语态只有以下几种,见下表.
1．动词不定式的时态和语态形式（以make为例）
语态
时态
主 动 语 态
被 动 语 态
一般时
to make
to be made
进行时
to be making
完成时
to have made
to have been made
完成进行时
to have been making
2. 一般式：不定式的一般式表示的动作或状态与谓语动词表示的动作同时发生或在起之后发生.例如：
I saw him climb up the tree.
Be quite. Our monitor has a piece of good news to tell us.
We hope to build up a modern laboratory before long.
我们在I.中所运用的动词不定式均为一般式的主动语态,这里不再多举例.
3. 进行式：不定式进行式表示的动作在谓语动词表示的动作发生时正在进行.例如：
The water seems to be boiling.
She was found to be teaching the pupils to make model planes.
Example:
If you are traveling forwards in a train, the things around you outside seem ____ backwards.
a. having moved b. to have moved c. to be moving d. to moving
4. 完成式：动词不定式表示的动作在谓语动词表示的动作之前发生.例如：
They are known to have come to a decision on the matter.
It was a great satisfaction to have revisited our native village.
如果动词不定式的完成式用在表示“需要”,“希望”,“打算”等意义的动词如hope, wish, expect, intend, mean 后以及用在情态动词should, could, ought(to), might和be to的过去时后,则说明动作没有实现.例如：
We meant to have had a meeting to discuss this problem.
我们本来打算开个会讨论这个问题.（但结果却没有开）
You should have switched off the light when you left the classroom.
你离开教室的时候应该把灯关掉.（实际上没有关灯）
We were to have built a laboratory behind the lecture building.
我们原来要在教学大楼后边盖一座实验室.（但后来没有盖）
Example:
Some people were reported ____ flying saucers that same evening.
a. to b. to ha